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Author:
gregrt83 (IN)
Hello. Novice plumber here. I am adding a bathroom to my home. It is a 2 story brick home built in the 1880's. The new bathroom is going into a 1 story addition added in the 1960's. The plumbing for the bathroom is running under the crawl space of the addition then through a small basement window opening (hopper window?) of the original home into the original basement. Due to various reasons and obstacles I was unable to get the slope of the sewage pipe correct to meet up with the original plumbing in the basement, so I decided to utilize a sewage pump. My concern is with the venting as I am trying to use an AAV. The bathroom is relatively small at 55 sq ft with a stand up shower, toilet, sink. I have all drains vented to a 2" pvc which will be vented by a minivent that will be in the wall with an accessible vent cover. I have 3" pvc sewage line tied in to the basin, with 2" pvc pipe out of the basin to the main sewage line, and a 2" vent pipe coming out of the sewage basin tied into the vent pipe in the bathroom. My concern is that venting of the sewage basin. I am concerned that when the basin pumps out the sewage the vent in the bathroom might not allow enough air into the system. I considered adding another AAV to the basin in the basement to allow more air to flow, maybe a maxivent? Would this be advisable? Also I understand that a sewage basin needs to "breathe" and can create positive air pressure as it fills. The sewage line from the basin connects to the main sewage line via a large cast iron sewage pipe that also vents through the roof, so I'm guessing that positive air pressure from the basin as it fills would travel through the sewage line from the basin and out through the cast iron vent pipe through the roof. Is my logic correct? Sorry for the length, but wanting to give as much detail as possible. I've actually tested the pump by filling it with water and it all seems to be working fine so far, but I'd like to get this correct the first time as it will be much harder to correct when the floor is put in. Thanks for any advice.
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Author:
packy (MA)
you have no choice.
the sewage basin MUST have a vent to the atmosphere.
an AAV allows air in but not out.
so when you run water out back, it will not enter the tank.
it is like blowing up a balloon.
so as water enters the tank it compresses the tank's air rather than just pushing it out the vent pipe.
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